:root {
    --bg-primary: #fcfaf7;
    --bg-secondary: #f3f1ed;
    --bg-card: #ffffff;
    --text-primary: #1a1a1a;
    --text-secondary: #5a5a5a;
    --accent-forest: #2d5a27;
    --accent-sage: #8da399;
    --accent-beige: #e5e1da;
    --border-color: #e5e1da;
    --ad-bg: #f5f3ef;
    --font-sans: 'Inter', system-ui, -apple-system, sans-serif;
    --font-serif: 'Playfair Display', Georgia, serif;
    --font-mono: 'JetBrains Mono', monospace;
    --shadow-subtle: 0 2px 10px rgba(45, 90, 39, 0.02);
    --shadow-medium: 0 4px 20px rgba(45, 90, 39, 0.05);
    --transition-smooth: 0.25s cubic-bezier(0.16, 1, 0.3, 1);
    --border-radius-sm: 4px;
    --border-radius-md: 8px;
    --border-radius-lg: 12px;
}

[data-theme="dark"] {
    --bg-primary: #121412;
    --bg-secondary: #1a1d1a;
    --bg-card: #161916;
    --text-primary: #fcfaf7;
    --text-secondary: #a0aba0;
    --accent-forest: #43843a;
    --accent-sage: #8da399;
    --accent-beige: #2a2f2a;
    --border-color: #262c26;
    --ad-bg: #191c19;
    --shadow-subtle: 0 2px 10px rgba(0, 0, 0, 0.2);
    --shadow-medium: 0 4px 20px rgba(0, 0, 0, 0.4);
}

*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
body {
    font-family: var(--font-sans);
    background-color: var(--bg-primary);
    color: var(--text-primary);
    line-height: 1.8;
    transition: background-color var(--transition-smooth), color var(--transition-smooth);
    overflow-x: hidden;
    -webkit-font-smoothing: antialiased;
}

a { color: var(--accent-forest); text-decoration: none; transition: color var(--transition-smooth); }
a:hover { color: var(--accent-sage); }
h1, h2, h3, h4 { font-family: var(--font-serif); font-weight: 700; line-height: 1.35; color: var(--text-primary); }

header {
    position: sticky;
    top: 0;
    z-index: 1000;
    background-color: var(--bg-primary);
    border-bottom: 1px solid var(--border-color);
    transition: background-color var(--transition-smooth);
}
.header-container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 16px 20px;
    display: flex;
    align-items: center;
    justify-content: space-between;
}
.logo {
    display: flex;
    align-items: center;
    gap: 12px;
    font-family: var(--font-serif);
    font-size: 1.4rem;
    font-weight: 700;
    color: var(--accent-forest) !important;
}
.logo svg { width: 32px; height: 32px; color: var(--accent-forest); }
nav .nav-links { display: flex; list-style: none; gap: 24px; align-items: center; }
.nav-link { font-size: 0.95rem; font-weight: 500; color: var(--text-secondary); padding: 6px 0; }
.nav-link:hover, .nav-link.active { color: var(--accent-forest); }
.controls { display: flex; align-items: center; gap: 12px; }
.theme-toggle, .mobile-menu-btn {
    background: none;
    border: 1px solid var(--border-color);
    padding: 8px;
    border-radius: var(--border-radius-sm);
    cursor: pointer;
    color: var(--text-primary);
    display: flex;
    align-items: center;
    justify-content: center;
}
.theme-toggle svg, .mobile-menu-btn svg { width: 20px; height: 20px; }
.mobile-menu-btn { display: none; }

.article-container {
    max-width: 860px;
    margin: 40px auto 80px;
    padding: 0 20px;
}
.breadcrumb { font-size: 0.85rem; color: var(--text-secondary); margin-bottom: 25px; }
.breadcrumb a { color: var(--text-secondary); }
.breadcrumb a:hover { color: var(--accent-forest); }

.article-header { margin-bottom: 35px; }
.article-category-badge {
    display: inline-block;
    background-color: var(--accent-forest);
    color: #ffffff;
    font-size: 0.75rem;
    font-weight: 600;
    padding: 4px 12px;
    border-radius: var(--border-radius-sm);
    text-transform: uppercase;
    letter-spacing: 1px;
    margin-bottom: 16px;
}
.article-header h1 { font-size: 2.4rem; margin-bottom: 16px; }
.article-meta {
    display: flex;
    align-items: center;
    gap: 20px;
    font-size: 0.9rem;
    color: var(--text-secondary);
    padding-bottom: 20px;
    border-bottom: 1px solid var(--border-color);
    flex-wrap: wrap;
}

.article-hero-img {
    width: 100%;
    height: 420px;
    object-fit: cover;
    border-radius: var(--border-radius-md);
    margin-bottom: 35px;
    box-shadow: var(--shadow-medium);
}

.article-content {
    background-color: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius-md);
    padding: 45px;
    box-shadow: var(--shadow-subtle);
}
.article-content h2 { font-size: 1.65rem; margin: 38px 0 16px; color: var(--accent-forest); border-bottom: 1px solid var(--border-color); padding-bottom: 8px; }
.article-content h2:first-of-type { margin-top: 0; }
.article-content h3 { font-size: 1.25rem; margin: 24px 0 12px; }
.article-content p { margin-bottom: 20px; color: var(--text-primary); font-size: 1.05rem; }
.article-content ul, .article-content ol { padding-left: 24px; margin-bottom: 24px; color: var(--text-primary); }
.article-content li { margin-bottom: 10px; font-size: 1.02rem; }

.callout-box {
    background-color: rgba(45, 90, 39, 0.06);
    border-left: 4px solid var(--accent-forest);
    padding: 20px 24px;
    margin: 30px 0;
    border-radius: 0 var(--border-radius-sm) var(--border-radius-sm) 0;
}
.callout-box h4 { margin-bottom: 8px; color: var(--accent-forest); }
.callout-box p { margin-bottom: 0; color: var(--text-primary); }

.warning-callout {
    background-color: rgba(220, 53, 69, 0.06);
    border-left: 4px solid #dc3545;
    padding: 20px 24px;
    margin: 30px 0;
    border-radius: 0 var(--border-radius-sm) var(--border-radius-sm) 0;
}
.warning-callout h4 { margin-bottom: 8px; color: #dc3545; }
.warning-callout p { margin-bottom: 0; color: var(--text-primary); }

.table-responsive {
    overflow-x: auto;
    margin: 30px 0;
}
table.article-table {
    width: 100%;
    border-collapse: collapse;
    font-size: 0.95rem;
}
table.article-table th {
    background-color: var(--accent-forest);
    color: #ffffff;
    padding: 12px 16px;
    text-align: left;
}
table.article-table td {
    padding: 12px 16px;
    border-bottom: 1px solid var(--border-color);
}
table.article-table tr:nth-child(even) {
    background-color: var(--bg-secondary);
}

.adsense-placeholder {
    background-color: var(--ad-bg);
    border: 2px dashed var(--border-color);
    border-radius: var(--border-radius-md);
    padding: 24px;
    margin: 40px 0;
    text-align: center;
}
.adsense-label {
    font-size: 0.65rem;
    font-family: var(--font-mono);
    color: var(--text-secondary);
    text-transform: uppercase;
    letter-spacing: 1px;
    display: block;
    margin-bottom: 6px;
}

.related-articles { margin-top: 50px; }
.related-articles h3 { font-size: 1.4rem; margin-bottom: 20px; border-bottom: 1px solid var(--border-color); padding-bottom: 8px; }
.related-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 20px; }
.related-card {
    background-color: var(--bg-secondary);
    padding: 20px;
    border-radius: var(--border-radius-sm);
    border: 1px solid var(--border-color);
}
.related-card a { font-weight: 600; color: var(--text-primary); display: block; margin-bottom: 8px; font-size: 1rem; }
.related-card a:hover { color: var(--accent-forest); }
.related-card p { font-size: 0.85rem; color: var(--text-secondary); margin-bottom: 0; }

footer {
    background-color: var(--bg-secondary);
    border-top: 1px solid var(--border-color);
    padding: 60px 20px 30px;
    margin-top: 80px;
}
.footer-grid {
    max-width: 1200px;
    margin: 0 auto;
    display: grid;
    grid-template-columns: 2fr 1fr 1fr 1.5fr;
    gap: 40px;
    padding-bottom: 40px;
    border-bottom: 1px solid var(--border-color);
}
.footer-column h4 { font-size: 1.1rem; margin-bottom: 18px; }
.footer-column p { color: var(--text-secondary); font-size: 0.9rem; margin-bottom: 16px; }
.footer-links { list-style: none; display: flex; flex-direction: column; gap: 10px; }
.footer-links a { color: var(--text-secondary); font-size: 0.9rem; }
.footer-links a:hover { color: var(--accent-forest); }
.footer-bottom {
    max-width: 1200px;
    margin: 30px auto 0;
    display: flex;
    justify-content: space-between;
    align-items: center;
    font-size: 0.85rem;
    color: var(--text-secondary);
    flex-wrap: wrap;
    gap: 15px;
}
.footer-bottom-links { display: flex; gap: 20px; }

@media (max-width: 768px) {
    .mobile-menu-btn { display: flex; }
    nav {
        position: fixed;
        top: 70px;
        left: -100%;
        width: 100%;
        height: calc(100vh - 70px);
        background-color: var(--bg-primary);
        display: flex;
        flex-direction: column;
        align-items: center;
        justify-content: center;
        transition: left 0.3s ease;
        border-top: 1px solid var(--border-color);
    }
    nav.active { left: 0; }
    nav .nav-links { flex-direction: column; gap: 24px; text-align: center; }
    .article-header h1 { font-size: 1.9rem; }
    .article-content { padding: 25px; }
    .article-hero-img { height: 260px; }
    .related-grid { grid-template-columns: 1fr; }
    .footer-grid { grid-template-columns: 1fr; }
}